LIGHTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a lighting device improved in device efficiency and heat radiation.SOLUTION: The lighting device includes: a light source which emits light; a light guiding part which has an emission face emitting light and a back face opposite to the emission face and has a reflection part for reflecting the light emitted by the light source toward the emission face at the back surface; a heat transmission part which faces the back face of the light guiding part and also is set to the back face with a space equal to or more than the wave length of the light; and a support part which is set between the reflection part and the heat transmission part and maintains the space between the light guiding part and the heat transmission part.